American Journal of Transportation and Logistics

  • Intermodal Terminal Design for Autonomous Freight Transportation Systems

    This paper investigates the design and operation of an intermodal terminal for Underground Freight Transportation (UFT) system. UFT is considered as a new mode of freight transportation that uses pipelines for transporting freight between two intermodal terminals. The load size and route length of the UFT system can be variable depending on the purpose and specifications of the project. In this paper two sizes of loads and two route lengths are considered to show that the terminal design and operation are independent from route length and load size. Each UFT route starts at the Port of Houston where shipping container or pallet size loads will be delivered to the UFT system. The short-haul route ends at a proposed intermodal satellite terminal outside Houston and the long-haul route terminates in a proposed intermodal inland port in Dallas. This paper develops inclusive equations to estimate the operational attributes of the UFT intermodal terminal. These attributes include operational headway, system flow, fleet size, and number of handlers/forklifts required in operation of the terminal. Based on the terminal operation requirements, a typical design for a UFT intermodal terminal is presented. In addition, the loading/unloading process and the freight circulation scheme are discussed. Although, this schematic terminal design and operation are for shipping container loads, but the same concept can be applied to smaller scale loads such as pallets.

  • Air pollution dispersion models-special reference to input parameters and application in sustainable urban planning

    Air pollution dispersion models have different applications including in sustainable urban planning. It is a model showing picture of reality and is widely used to make predictions thereby solve problems and make compatible strategies for the management of specific environmental problems. The output of a model is precisely dependent on source strength of pollutants, meteorology, topography, dispersion coefficients, and plume rise and so on so forth. An effort has been made in the present paper by the authors to precisely estimate the source strength, dispersion coefficients, plume rise etc along with type of air diffusion models and their relevance on urban planning.

  • Factors Affecting E-bike Mode Choice in a Medium-sized Chinese City

    Chinese medium-sized cities have different travel characteristics compared to big cities. And as the rapid development of e-bike in China, some problems such as transportation safety has been discussed by scholars. This paper examines the factors affecting residents’ travel mode choice in medium-sized city using travel survey data collected from residents in Zhongshan city. An estimated nested logit model of travel mode choice reveals that: (1) Older people prefer to travel by e-bikes than younger people. (2) Residents who own e-bikes tend to choose e-bikes, while not other vehicles. And the profession of people who prefer to travel by electric bicycle the white collar and blue collar. (3) About the attitude of Zhongshan residents to choose the way of transportation, the e-bike is considered the least safe, and electric bicycle users are concerned about the improvement of bicycle lanes. (4) The influence of built environment in the place of origin and the place of destination on the choice of e-bikes is different. (5) There is a substitution effect between e-bikes and traditional bicycles. The results strongly suggest that e-bike is a kind of important transportation in Chinese medium-sized city, and it is likely to regulate e-bike by transportation policies.

  • Built to Last? The Changing Role of Ocean Transportation Intermediaries: Disintermediation and Reintermediation

    Introduction Ongoing changes in the maritime container shipping industry and the introduction of new technologies are dramatically changing the role of the ocean transportation intermediary (OTI’s). Full service intermediaries can secure space with ocean carriers, offer customer transloading, consolidation, trucking, freight forwarding, customs brokerage and a range of other services that are crucial to the movement of goods. In high volume markets such as the Transpacific trade lane, the role of intermediary has grown as the liner shipping firms utilize mergers, alliances, vessel sharing agreements and mergers in an effort to remain financially viable. Approximately 42% of Transpacific moves are handled by NVOCCs at the time of this writing (Mongelluzzo, 2016). Delayed vessel calls, poorly aligned chassis supply and changing carrier alliances have provided an opening to OTI’s to sell themselves as supply chain experts who help their shipper customers navigate the complexities of international shipping by providing more value added services than the liner shipping operators (Landon, 2015). As the need for skilled intermediaries has grown, new online platforms from advanced technology firms have the potential for disintermediation- ‘cutting out the middle man’ from transactions for a variety of core ocean freight processes like procurement, forwarding, and supply chain visibility (Steele, 2009). This has long been predicted since the advent of the Internet but has only now reached the critical mass of advanced technology programming and large scale equity investment that will lead to a similar software revolution in logistics as has transformed other aspects of the economy. The advent of new freight technologies will most likely lead to the demise of many OTI’s who are not scaled to be able to utilize the software but also possibly create the formation of new skilled intermediaries (i.e. reintermediation) that create markets and enhance value to customers through innovations to produce…

  • GSM and Mobile Telephony Trends

    GSM is an important technology to the world today, ensuring the connectivity of billions of individuals across the world. In this paper, the subject of mobile telephony is addressed, we look at the GSM technology detailing how it works and also look at the structure it is comprised of. Also, we see the trends experienced in then network system and see how due to technological advancement, the technology has grown to services billion of individuals today.

  • Intrusion Detection Systems Technologies and Trends

    The issue of security is a major issue as regarding the use of various systems and also technologies being applied today. We live in a completely digital age and information security is paramount. Intrusion detection systems help to ensure that attacks on network systems is eradicated. This paper presents a review on Intrusion Detection Systems (IDS) details it’s model and various security threats that it addresses.

  • Performance Evaluation of OTT Communication Services

    This paper assesses the performance and efficiency of Over the Top service applications. Over the Top services has affected the methods and ways information is passed from content creators to consumers. This paper assesses the performance of two of the most heavily utilized over the top applications which include WhatsApp and Skype. We measure their performance on 4 metrics which includes CPU performance, Latency, End-to-End Latency and Load per Period. We see how both these applications perform based on the measurements derived from these metrics.

  • Transformation of waste to energy- Available technological options in India

    Urban, industrial, biomass and biomedical wastes are being generated in huge quantities world over causing significant environmental problems including human health. Such generation of waste is on increasing trend with the increase in population along with corresponding increase in industrialization and urbanization. In order to address such an alarming issue of such waste, it has become essential to transform this waste into usable product through technological development and innovation techniques which would not only take care of environmental problems but also act as economic tools to manage wastes. An effort has therefore been made by the authors of the present paper to discuss various technological options available to transform such wastes into energy, fuel pallets, compost, and methane gas etc.